MNK involves having lower GCD (around ~2 seconds, like NIN) and dashing around the enemies for positional attacks and manage your Grease Lightning buff to maximize your DPS.

DRG involves lesser amount of positional and higher GCD (around 2.39-2.4 seconds), but need to pay more attention to their buffing skills (Blood of the Dragon, Blood for blood and weaving in multiple Jumps) to maximize their DPS.

Personal DPS expectation: MNK > DRG > NIN
Raid DPS contribution: NIN > DRG > MNK